DEQ500 Owner's Manual. 20 Band Graphic Equalizer. Dual 10 Bands EQ with Blue LEDs. One 10-band EQ. Removable Rack Mount Brackets. center frequencies: 30 Hz, 60 Hz, 120 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz.
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